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A kind of preparation method of silicone rubber composite hollow fiber membrane

A fiber membrane and silicone rubber technology, which is applied in the field of preparation of silicone rubber composite hollow fiber membranes, can solve the problems of poor interaction between organic layers and inorganic particles, uneven dispersion of inorganic particles, poor film-forming properties, and poor mechanical properties. The effect of improving mechanical strength and toughness, increasing hydrophobicity, and improving dispersion performance

Active Publication Date: 2016-08-24
广东彩艳股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the silicone rubber membrane has good selectivity, its own film-forming property and mechanical properties are poor. Filling the silicone rubber with inorganic particles (such as molecular sieves, zeolites, etc.) An important development direction in the field of chemical film
However, key technical problems such as uneven dispersion of inorganic particles and poor interaction between organic layers and inorganic particles during the film-making process limit its further application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Preparation of hydrophobically modified nano-calcium carbonate: add the dried nano-calcium carbonate to oleic acid under stirring conditions, stir and react at 90°C for 2 hours, and then repeatedly wash the nano-calcium carbonate with solvent n-hexane to remove excess oil Acid, placed in a vacuum oven at 80°C, dried, and ground to obtain hydrophobically modified nano-calcium carbonate

[0016] (2) Preparation of silicone rubber casting solution: dissolve 10g of polydimethylsiloxane in n-hexane, stir well, add 0.05g of hydrophobically modified nano-calcium carbonate, ultrasonically disperse, add 0.5g of tetraethyl orthosilicate and mix Stir for 2 hours, then add 0.1g of dibutyltin dilaurate, and then add n-hexane until the concentration of polydimethylsiloxane in the mixed solution is 10wt%, stir at room temperature for 8 hours, centrifuge and defoam to make a casting solution ;

[0017] (3) Preparation of composite hollow fiber membrane: immerse the dried neutral p...

Embodiment 2

[0020] (1) Preparation of hydrophobically modified nano-calcium carbonate: Add the dried nano-calcium carbonate to stearic acid under stirring conditions, stir and react at 70°C for 8 hours, and then repeatedly wash the nano-calcium carbonate with solvent n-hexane to remove excess Stearic acid is dried in a vacuum oven at 80°C, and ground to obtain hydrophobically modified nano-calcium carbonate;

[0021] (2) Preparation of silicone rubber composite film: Dissolve 10g of polydimethylsiloxane in n-hexane, stir evenly, add 1g of hydrophobically modified nano-calcium carbonate, ultrasonically disperse, add 0.8g of phenyltriethoxysilane and mix Stir for 1 hour, then add 0.3g of dibutyltin dilaurate, and then add n-hexane until the concentration of polydimethylsiloxane in the mixed solution is 20wt%, stir at room temperature for 10 hours, centrifuge and defoam to make a casting solution ;

[0022] (3) Preparation of composite hollow fiber membrane: immerse the dried neutral polyte...

Embodiment 3

[0025] (1) Preparation of hydrophobically modified nano-calcium carbonate: add the dried nano-calcium carbonate to oleic acid under stirring conditions, stir and react at 80°C for 4 hours, and then repeatedly wash the nano-calcium carbonate with solvent n-hexane to remove excess oil acid, placed in a vacuum oven at 80°C to dry, and ground to obtain hydrophobically modified nano-calcium carbonate;

[0026] (2) Preparation of silicone rubber composite film: Dissolve 10 g of polydimethylsiloxane in n-hexane, stir evenly, add 3 g of hydrophobically modified nano-calcium carbonate, ultrasonically disperse, add 1 g of tetraethyl orthosilicate, mix and stir for 0.5 hours , then add 0.5g dibutyltin dilaurate, and then add n-hexane until the concentration of polydimethylsiloxane in the mixed solution is 40wt%, stir at room temperature for 8 hours, centrifuge and defoam to make a casting solution;

[0027] (3) Preparation of composite hollow fiber membrane: immerse the dried neutral polya...

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PUM

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Abstract

The invention discloses a preparation method of a silicone rubber composite hollow fiber membrane. The steps are: (1) adding dried nano-calcium carbonate to a modifier, stirring and reacting, and then repeatedly washing the nano-calcium carbonate with n-hexane to remove Excess modifying agent, vacuum drying, and finally grinding to obtain hydrophobic modified nano-calcium carbonate; (2) dissolve polydimethylsiloxane in n-hexane, stir evenly, add hydrophobic modified nano-calcium carbonate, ultrasonically disperse, Finally, add cross-linking agent and catalyst, stir and react, centrifuge and defoam to make casting solution; (3) immerse the dried neutral hydrophobic hollow fiber base membrane in casting solution for 2-3 seconds, and then take out Dry at room temperature, repeat the above-mentioned dipping and drying operations for 2 to 3 times, and vacuum-dry to complete cross-linking to obtain a hydrophobically modified nano-calcium carbonate-filled silicone rubber composite hollow fiber membrane. The process of the invention is simple, and the obtained hollow fiber membrane has good separation effect on low-concentration butanol / water solution, and has broad industrial application prospects.

Description

technical field [0001] The invention relates to a preparation method of a silicone rubber composite hollow fiber membrane used for pervaporation preferentially permeating butanol, and belongs to the field of pervaporation membrane separation. Background technique [0002] Affected by the energy crisis, oil prices have risen, butanol, as a new type of bioenergy, has received more and more attention. The product of butanol produced by biological fermentation (ABE fermentation) mainly contains acetone, butanol and ethanol, and the ratio of the three is 3:6:1. Mainly due to the inhibition of the product butanol, the total solvent concentration in the fermentation broth can only reach about 20gL -1 , lower production capacity. In order to solve the above problems, scientists try to combine some separation methods, such as pervaporation (PV), adsorption, liquid-liquid extraction, gas stripping and reverse osmosis, etc. (Ezeji, T.C., N. Qureshi, and H.P. Blaschek, Butanol ferment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D69/12B01D67/00
Inventor 陈雄
Owner 广东彩艳股份有限公司
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